71205246225 has 18 divisors (see below), whose sum is σ = 127536508086. Its totient is φ = 37976131200.

The previous prime is 71205246221. The next prime is 71205246247. The reversal of 71205246225 is 52264250217.

71205246225 is a `hidden beast` number, since 7 + 1 + 2 + 0 + 5 + 24 + 622 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 7781356944 + 63423889281 = 88212^2 + 251841^2 .

It is not a de Polignac number, because 71205246225 - 2² = 71205246221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71205246225.

It is not an unprimeable number, because it can be changed into a prime (71205246221) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 158233656 + ... + 158234105.

Almost surely, 2^71205246225 is an apocalyptic number.

71205246225 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

71205246225 is a deficient number, since it is larger than the sum of its proper divisors (56331261861).

71205246225 is a wasteful number, since it uses less digits than its factorization.

71205246225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316467777 (or 316467769 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The spelling of 71205246225 in words is "seventy-one billion, two hundred five million, two hundred forty-six thousand, two hundred twenty-five".